SLASEC8B February 2017 – January 2019 PGA460-Q1
The no-response operation on the UART interface is fairly straightforward. The command field specifies the address and command for the operation, where the subsequent data bytes, if any, are to be stored in the PGA460-Q1 device. The number of data bytes to be sent is predetermined by the UART command. The last field in the frame is the checksum field which is generated by the master. Figure 26 shows an example of memory register write operation (command 10).
If a NO-RESPONSE command arrives on the UART interface while another NO-RESPONSE command is also served or if the PGA460-Q1 device is busy performing functions, then the previous command is aborted and the new command is served immediately. This process is particularly important when the PGA460-Q1 device is running a record interval because of any of the Command0 through Command4 or Command17 through Command21 being previously received while another command is received on the UART. In this case, the PGA460-Q1 device aborts the previous command and terminates the current record interval after which it initiates a new command serving cycle.